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Formula: Mg(U6+O2)2(As3+O3,As5+O4)2.7H2O
Hydrated arsenite, uranyl mineral
Crystal System: Monoclinic
Specific gravity: 3.70 measured, 3.60 calculated for material from Talmessi and 3.71 calculated for material from
Rabejac
Hardness: 3
Streak: White
Colour: Canary yellow to bright yellow
Luminescence: Not fluorescent under UV
Very strongly RADIOACTIVE
Environments
Seelite is a rare mineral in the oxidation zone of uranium-bearing
hydrothermal deposits
(HOM).
Localities
There are two co-type localities, Rabejac Est, Le Puech, Lodève, Hérault, Occitanie, France, and the Talmessi Mine,
Anarak District, Nain County, Isfahan Province, Iran.
Seelite occurs as transparent canary-yellow tabular crystals, with a maximum length of 1 mm; they commonly form
tufted spherules and rosettes of divergent hair-like needles
(Mindat).
At the Talmessi mine they are associated with annabergite,
talmessite, zaratite and
uranospinite, and at Rabejac they
are associated with zeunerite
(HOM).
Seelite from the Talmessi Mine - Image
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